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Type: open cluster
Mag: B=?, V=13.4
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NGC 1745 is a diffuse nebula -- probably an emission nebula -- in the NGC 1743 complex in the LMC. John Herschel's position was an estimate based on his measured positions for NGC 1743 and N1748, but it is close enough to the correct position to identify the nebula without question.
N1745 is called a star cluster in the ESO/Uppsala catalogue, but this is wrong. Furthermore, there is no cluster at the ESO position, but just a group of faint stars.
John Herschel recorded it as "faint, small, No 3 in a group of 4. Place estimated from No. 2." The four objects are NGC 1737, 1743, 1745 and NGC 1748.
Recorded in "Observations of the Southern Nebulae made with the Great Melbourne Telescope".
See the discussion of Lithograph M.3.22 for the details.
Henize (Catalogues of Hydrogen Alpha Emission Stars and Nebulae in the Magellanic Clouds, Astrophysical Journal Supplement 2, 1956, p315), his nebula LH N 120-83 "includes NGC 1745 and NGC 1737." This nebula he describes as measuring 5.7' east-west x 5' north-south, quite irregular in outline, slightly elongated and showing considerable structure.
The RNGC (Sulentic and Tifft 1973) notes that this is a cluster+nebulosity in the LMC.
15cm - vf w/a few *s and no neb @ 195x. BS, 12Nov1993, LCO.
The Messier objects
The Bennett objects
The Caldwell list
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